Hynynen K
Department of Radiation Oncology, University of Arizona Health Sciences Center, Tucson 85724.
Med Phys. 1993 Jan-Feb;20(1):129-34. doi: 10.1118/1.597094.
Preliminary clinical results indicate that some tumors can be heated well utilizing cylindrical ultrasound sources placed in body cavities. In this paper a simple method for measuring the acoustic power from cylindrical intracavitary transducers will be described. The radially propagating acoustic field was converted to a beam with a single propagation direction by a brass reflector, and the radiation force generated by this beam on an absorbing target was measured. The power output of several clinical intracavitary arrays varied significantly between identically shaped transducer elements. The results show that it is important to measure the acoustic power output from each element prior to its clinical use. The radiation force technique is simple and sensitive and can be easily adapted to be used as a routine clinical quality assurance method.
初步临床结果表明，利用置于体腔内的圆柱形超声源可以很好地加热某些肿瘤。本文将描述一种测量圆柱形腔内换能器声功率的简单方法。通过一个黄铜反射器将径向传播的声场转换为具有单一传播方向的波束，并测量该波束在吸收靶上产生的辐射力。几个临床腔内阵列的功率输出在形状相同的换能器元件之间差异显著。结果表明，在临床使用前测量每个元件的声功率输出很重要。辐射力技术简单且灵敏，可轻松适用于作为常规临床质量保证方法。
